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The Road Runner runs and drives! BUT..need help.Update! #1299287
09/07/12 05:43 PM
09/07/12 05:43 PM
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Great Lakes State
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ONEBADBIRD Offline OP
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Well the 69 Road Runner is on the road! but...., about 20 minutes into the ride it starts to run rougher and rougher until it dies completely. What I have is a 440 block rebuilt with stock iron heads rebuilt, stock intake, 750 Holley double pumper carb (mech. secondaries), Mopar electronic ignition(all new components), 727 trans rebuilt(with new converter), power disc brake upgrade (front only). So the car has had the timing set and the carb idle adjusted and runs great off the start idles good, runs good under the load of the trans, but after about 20 minute ride or so it starts to run rougher and rougher until it just stalls out completely. It has 195 thermostat and runs cool while driving around 190/195. It has a new sending unit (5/16) in the gas tank, new gas, new rubber lines, new fuel filter. Now to me it just seems related that when everything under the hood warms up it starts acting up. Checked vacuum lines but will re-check again. What do you make of this situation? Have you experienced this similiar behavior with your ride? What should I check next? Thanks, Jay

Last edited by ONEBADBIRD; 09/09/12 12:01 PM.
Re: The Road Runner runs and drives! BUT.......need help. [Re: ONEBADBIRD] #1299288
09/07/12 05:51 PM
09/07/12 05:51 PM
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Andrewh Online content
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you didn't say, can you restart immediatly?
if not, how long till you can?
once you can does it run fine?

when it is dead, did you check for spark, fuel?

Re: The Road Runner runs and drives! BUT.......need help. [Re: Andrewh] #1299289
09/07/12 06:02 PM
09/07/12 06:02 PM
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ONEBADBIRD Offline OP
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It can be re-started but runs rough still at idle and when put into gear it dies. It has good fuel pressure took everything apart and cranked it over and was pumping good past the filter too, Now I thought the problem yesterday was the vacuum line going from the carb to the brake booster. Found out that this morning it was darn near falling off the brake booster side...so I hooked another hose up and away we went, ran fine stopped for gas (3rd time now for gas at different gas stations). Went about 3 miles then things started acting up running rougher while in gear got her home then she die in the drive. It has good oil pressure too averages about 40 psi give or take depend on the throttle.

Re: The Road Runner runs and drives! BUT.......need help. [Re: ONEBADBIRD] #1299290
09/07/12 06:07 PM
09/07/12 06:07 PM
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bethlehem pa
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mikemee1331 Offline
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sounds to me as if either your coil or your ECU is getting hot. you are running a ballast correct? orange box?

Re: The Road Runner runs and drives! BUT.......need help. [Re: mikemee1331] #1299291
09/07/12 06:44 PM
09/07/12 06:44 PM
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I am running an orange box, Yes, and the ballast resistor 4 pin one that goes with my electronic ignition harness upgrade.

Re: The Road Runner runs and drives! BUT.......need help. [Re: ONEBADBIRD] #1299292
09/07/12 06:48 PM
09/07/12 06:48 PM
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weymouth,mass.
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i'm guessing ECU,had a new one crap out on me,at the same time i was trying installing my 6pak,how aggreivating,pertronix now good luck

Re: The Road Runner runs and drives! BUT.......need help. [Re: ONEBADBIRD] #1299293
09/07/12 06:52 PM
09/07/12 06:52 PM
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Great Lakes State
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My orange box is against the firewall along with the ballast resistor and the coil is mounted on top of the intake as stock. I have an (Accel coil yellow super stock) are they junk too? It seems to me the heat is affecting something? I have heard some people running the chrome box but why? It runs great to start but starts running like the timing is off? Is there any way to test any of these mentioned components? Thanks, Jay

Last edited by ONEBADBIRD; 09/07/12 06:58 PM.
Re: The Road Runner runs and drives! BUT.......need help. [Re: ONEBADBIRD] #1299294
09/07/12 06:57 PM
09/07/12 06:57 PM
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not sure how you will test,my car ran great,sputtered and died after 15 min.,cool for a few minutes fire right up,ran great again for 15min,ECU was getting hot(mounted on firewall as well).if it was me i would buy a new one and install,should be able to grab one for 25.00 at autozone or the likes

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Re: The Road Runner runs and drives! BUT.......need help. [Re: meepmeep70] #1299295
09/07/12 06:59 PM
09/07/12 06:59 PM
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Great Lakes State
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Thanks for the info everyone so far! Jay

Re: The Road Runner runs and drives! BUT.......need help. [Re: ONEBADBIRD] #1299296
09/07/12 06:59 PM
09/07/12 06:59 PM
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Harm City Md.
Dan Halen Offline
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Just went through this with a friends car. When the car stalls

see if you can hold your hand on the carb without burning it. He

added a heat shield under the carb and now it runs great.

Re: The Road Runner runs and drives! BUT.......need help. [Re: meepmeep70] #1299297
09/07/12 07:43 PM
09/07/12 07:43 PM
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Quote:

not sure how you will test,my car ran great,sputtered and died after 15 min.,cool for a few minutes fire right up,ran great again for 15min,ECU was getting hot(mounted on firewall as well).if it was me i would buy a new one and install,should be able to grab one for 25.00 at autozone or the likes


this would be my suggestion. what ohm is the ballast you are using, and no that coil is not junk.

Re: The Road Runner runs and drives! BUT.......need help. [Re: mikemee1331] #1299298
09/07/12 07:58 PM
09/07/12 07:58 PM
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Lincoln Nebraska
RapidRobert Offline
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Quote:

.if it was me i would buy a new one and install,should be able to grab one for 25.00 at autozone or the likes


this would be my suggestion.


X3. Less likely would be the coil or the pickup (check the gap though). Unrelated to your issue you mentioned a 4 terminal ballast, clarify that if you would


live every 24 hour block of time like it's your last day on earth
Re: The Road Runner runs and drives! BUT.......need help. [Re: RapidRobert] #1299299
09/07/12 10:23 PM
09/07/12 10:23 PM
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Well I picked up a new ECU at the local auto parts store and it seems so far to do the trick! Thank you for the advice everyone! As far as the 4 post ballast I'll have to take a pic of it. What I did was pick up new wiring from M&H and the ballast required 2 male prongs on one side and 2 on the other. From reading other post on the net, Since I am using the 4 prong ECU I do not need the use of the 4 prong ballast? I'm learning as I go! The motor is staying running as it should so far so good. Now I need to fix the dash lights, valve cover leaks , exhaust leaks, adjust trans and carb linkage etc..... The joys of the old car I love it though. I'll have to post some pics of her out of the garage after 8 years! Until my next question Thanks again. Jay

Re: The Road Runner runs and drives! BUT.......need help. [Re: ONEBADBIRD] #1299300
09/07/12 10:37 PM
09/07/12 10:37 PM
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Lincoln Nebraska
RapidRobert Offline
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Quote:

Well I picked up a new ECU at the local auto parts store and it seems so far to do the trick!


Success . I didn't think the 4 terminal ballast harness was used in '69. I'm assuming the 4 terminal ballast will plug in to the harness (has 2 double ends) only 1 way so that you are on the lowest ohm half of the ballast. As you researched the other side of the ballast is not used on a 4 pin ECU.


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Re: The Road Runner runs and drives! BUT.......need help. [Re: RapidRobert] #1299301
09/08/12 07:58 AM
09/08/12 07:58 AM
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Quote:

Quote:

Well I picked up a new ECU at the local auto parts store and it seems so far to do the trick!


Success . I didn't think the 4 terminal ballast harness was used in '69. I'm assuming the 4 terminal ballast will plug in to the harness (has 2 double ends) only 1 way so that you are on the lowest ohm half of the ballast. As you researched the other side of the ballast is not used on a 4 pin ECU.


you sir are correct. 69 should be a 2 pin. but, don't we all tend to use what we got and make it work? that's half the fun!

Re: The Road Runner runs and drives! BUT.......need help. [Re: mikemee1331] #1299302
09/08/12 02:50 PM
09/08/12 02:50 PM
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Well I picked up a new ECU at the local auto parts store and it seems so far to do the trick!.
great,next trip to the store buy a spare,because you will be happy it is in the trunk,even if never needed

Re: The Road Runner runs and drives! BUT.......need help. [Re: meepmeep70] #1299303
09/09/12 12:07 PM
09/09/12 12:07 PM
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Well the car is up to its old tricks again! Took it out last night about 20 to 30 minutes and it slowly started to go down hill with starting to stumble and chugging. I could hear it coming on so I headed for home and as I turned the corner it died out let it sit for 30 seconds and fire it up chirped the tires a few time to keep it running and pulled into the drive in which it died again. Sounds to me like it could be a fuel delivery problem maybe?

Re: The Road Runner runs and drives! BUT.......need help. [Re: ONEBADBIRD] #1299304
09/09/12 12:14 PM
09/09/12 12:14 PM
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It also seems that even when running good when first taken out it runs like an old dog. It just seem like it is not winding up with all of it's potential. So now thinking probably vacuum, or fuel. Assuming it was vacuum related I would think it would stall and stumble from the start not 20 to 30 minutes later? Just thinking out loud. Thanks for any input, Jay

Re: The Road Runner runs and drives! BUT.......need help. [Re: ONEBADBIRD] #1299305
09/09/12 12:30 PM
09/09/12 12:30 PM
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Quote:

Well the car is up to its old tricks again! Took it out last night about 20 to 30 minutes and it slowly started to go down hill with starting to stumble and chugging. I could hear it coming on so I headed for home and as I turned the corner it died out let it sit for 30 seconds and fire it up chirped the tires a few time to keep it running and pulled into the drive in which it died again. Sounds to me like it could be a fuel delivery problem maybe?


this is more consistent with a gradual buildup of heat in the electricial components than it is with a fuel issue. that leads me back to the 4 pin ballast when 1969 only has 2. how old is that coil? and once again, what ohm is that ballast? do you know why your wiring has been changed to a 4 pin??

Re: The Road Runner runs and drives! BUT.......need help. [Re: ONEBADBIRD] #1299306
09/09/12 12:34 PM
09/09/12 12:34 PM
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dark side of the moon
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I use the chrome box in both of mine. Used them for years in other cars. Never had any trouble with chrome box. Lots of people have problems with orange box.

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